Why did Dave pelzers mother abuse him?

David Pelzer, author of â??A Child Called Itâ?? was victimized by a sadistic and mentally ill mother. She treated the dehumanization and abuse of this little boy as a game. Fortunately, authorities stepped in and the child was removed from the home before the abuse escalated into murder. He went on to write several books about the abuse and his journey of healing after his ordeal.